将remove navigationBar border转换为swift

我正试图在swift中删除navigationBar边框.这是通过在objective-c中使用以下代码来完成的:

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault]

怎么能在swift中完成？

我试过这个,但没有工作:

UINavigationBar.appearance().shadowImage = UIImage(named: "")
UINavigationBar.appearance().setBackgroundImage(UIImage(named: ""), forBarMetrics: UIBarMetrics.Default)

小智.. 11

试试这个:

UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)

小智.. 8

要更改背景,文本和图标的颜色,并且还通过删除外观代理导航栏的边框/阴影,在插入此代码didFinishLaunchingWithOptions:的AppDelegate:

// our colors
let backgroundColor = UIColor.blueColor()
let foregroundColor = UIColor.whiteColor()

// status bar text color (.LightContent = white, .Default = black)
UIApplication.sharedApplication().statusBarStyle = .LightContent
// solid or translucent background?
UINavigationBar.appearance().translucent = false
// remove bottom shadow
UINavigationBar.appearance().shadowImage = UIImage()
// background color
UINavigationBar.appearance().setBackgroundImage(backgroundColor.toImage(), forBarMetrics: UIBarMetrics.Default)
// controls and icons color
UINavigationBar.appearance().tintColor = foregroundColor
// text color
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName: foregroundColor]

注意:正如您所看到的,我们需要转换UIColor为UIImage,因此您可以使用此扩展名:

extension UIColor{
    func toImage() -> UIImage {
        let rect = CGRectMake(0, 0, 1, 1)
        UIGraphicsBeginImageContextWithOptions(rect.size, true, 0)
        self.setFill()
        UIRectFill(rect)
        var image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

像这样使用它: UIColor.redColor().toImage()